Final answer:
The correct ending for the verb 'buscar' in the 'Yo' form in the preterit tense is 'busqué'.
Step-by-step explanation:
The correct ending for the verb 'buscar' in the 'Yo' form in the preterit tense is 'busqué'. In Spanish, the preterit tense is used to talk about completed actions in the past. The ending '-é' is used for regular -ar verbs like 'buscar' when conjugated in the 'Yo' form. For example, 'Yo busqué la respuesta correcta.' (I searched for the correct answer.)
Learn more about Conjugation of Spanish verbs